Dark blue color attracts the algae. However copper pennies in the water or copper wires, would stop the algae growth possibly.
Iran isn’t as much the culprit as Israel is. Whose idea was it to install the Mulluhs in the late 70’s? Israel’s, and they got Jimmy Carter to do it and he was weak. Who uses Iran to threaten the rest of the world? Israel. It’s always been a game. Trump just isnt playing their game now.